That looks like a floor length sheath dress with a short poncho-style yoke over it, that's probably attached. I don't know if there's a technical name for it, but if you search "floor length sheath" or "floor length column dress" along with "batwing sleeve", "angel wing sleeve", or "caftan sleeve", (there is yet another type of sleeve that's similar, but I can't think of it right now) you get some results that have similar lines.

That looks like a floor length sheath dress with a short poncho-style yoke over it, that's probably attached. I don't know if there's a technical name for it, but if you search "floor length sheath" or "floor length column dress" along with "batwing sleeve", "angel wing sleeve", or "caftan sleeve", (there is yet another type of sleeve that's similar, but I can't think of it right now) you get some results that have similar lines.

I agree, it seems to be a sheath dress with a yoke over it. It's a variation of the one on the right, I think it might be a sleeveless dress with a simple capelet over it. I can't be sure though